SG II - More close combat

I posted a question last week about defenders withdrawing in the face of a
close assault. Well, now that I've read the rules a little more, my question
is answered in the book (I love this game!).

Overrun addresses the question by allowing the attacker to immediately take
another confidence test to continue the assault. That way the attacker can
keep chasing down the defender until they leave the field or stand and fight.

As long as they can keep their nerve, that is.